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The dosage can be increased for cancer, the herbs are not dangerous unless you have an allergy to any of them.
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My aunt is 73 years old. Can the dosage be increased to twice, i.e., 1/4 teaspoon 3X daily? This would be equivalent to 1 teaspoon 3X daily for the powder formulation. Is this just right or too much? What do you suggest?
That is fine.
Remind her to drink plenty of water throughout the day.